<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://cdn.bootcdn.net/ajax/libs/vue/3.2.47/vue.global.js"></script>
</head>
<body>
  <div id="app"></div>
  <script src="http://unpkg.com/vue@next"></script>
  <script>
    const app = Vue.createApp({
      template: '<h2>Hello Vue3</h2>'
    });
    app.mount('#app');
  </script>
</body>
</html>